mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-07-30 18:50:59 +00:00
6323d6803e
Added a BaseComponentType to VecTraits that recursively finds the base (non-Vec) type of a Vec. This is useful when dealing with potentially nested Vec's (e.g. Vec<Vec<T, M>, N>) and you need to keep the structure but know the base type. Also added a couple of templates for keeping the structure but changing the type. These are ReplaceComponentType and ReplaceBaseComponentType. These allow you to create new Vec's with the same structure as the query Vec but with differen component types.
131 lines
3.7 KiB
C++
131 lines
3.7 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#ifndef vtk_m_VecFromPortal_h
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#define vtk_m_VecFromPortal_h
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#include <vtkm/Math.h>
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#include <vtkm/TypeTraits.h>
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#include <vtkm/Types.h>
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#include <vtkm/VecTraits.h>
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#include <vtkm/internal/ArrayPortalValueReference.h>
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namespace vtkm
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{
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/// \brief A short variable-length array from a window in an ArrayPortal.
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///
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/// The \c VecFromPortal class is a Vec-like class that holds an array portal
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/// and exposes a small window of that portal as if it were a \c Vec.
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///
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template <typename PortalType>
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class VecFromPortal
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{
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public:
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using ComponentType = typename std::remove_const<typename PortalType::ValueType>::type;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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VecFromPortal()
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: NumComponents(0)
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, Offset(0)
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{
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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VecFromPortal(const PortalType& portal, vtkm::IdComponent numComponents = 0, vtkm::Id offset = 0)
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: Portal(portal)
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, NumComponents(numComponents)
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, Offset(offset)
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{
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}
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VTKM_EXEC_CONT
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vtkm::IdComponent GetNumberOfComponents() const { return this->NumComponents; }
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template <typename T, vtkm::IdComponent DestSize>
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VTKM_EXEC_CONT void CopyInto(vtkm::Vec<T, DestSize>& dest) const
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{
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vtkm::IdComponent numComponents = vtkm::Min(DestSize, this->NumComponents);
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for (vtkm::IdComponent index = 0; index < numComponents; index++)
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{
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dest[index] = this->Portal.Get(index + this->Offset);
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}
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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vtkm::internal::ArrayPortalValueReference<PortalType> operator[](vtkm::IdComponent index) const
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{
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return vtkm::internal::ArrayPortalValueReference<PortalType>(this->Portal,
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index + this->Offset);
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}
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private:
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PortalType Portal;
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vtkm::IdComponent NumComponents;
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vtkm::Id Offset;
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};
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template <typename PortalType>
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struct TypeTraits<vtkm::VecFromPortal<PortalType>>
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{
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private:
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using ComponentType = typename PortalType::ValueType;
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public:
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using NumericTag = typename vtkm::TypeTraits<ComponentType>::NumericTag;
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using DimensionalityTag = TypeTraitsVectorTag;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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static vtkm::VecFromPortal<PortalType> ZeroInitialization()
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{
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return vtkm::VecFromPortal<PortalType>();
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}
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};
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template <typename PortalType>
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struct VecTraits<vtkm::VecFromPortal<PortalType>>
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{
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using VecType = vtkm::VecFromPortal<PortalType>;
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using ComponentType = typename VecType::ComponentType;
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using BaseComponentType = typename vtkm::VecTraits<ComponentType>::BaseComponentType;
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using HasMultipleComponents = vtkm::VecTraitsTagMultipleComponents;
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using IsSizeStatic = vtkm::VecTraitsTagSizeVariable;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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static vtkm::IdComponent GetNumberOfComponents(const VecType& vector)
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{
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return vector.GetNumberOfComponents();
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC_CONT
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static ComponentType GetComponent(const VecType& vector, vtkm::IdComponent componentIndex)
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{
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return vector[componentIndex];
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}
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VTKM_SUPPRESS_EXEC_WARNINGS
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template <vtkm::IdComponent destSize>
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VTKM_EXEC_CONT static void CopyInto(const VecType& src, vtkm::Vec<ComponentType, destSize>& dest)
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{
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src.CopyInto(dest);
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}
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};
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} // namespace vtkm
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#endif //vtk_m_VecFromPortal_h
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